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File: //lib/firewalld/services/mdns.xml

<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>Multicast DNS (mDNS)</short>
  <description>mDNS provides the ability to use DNS programming interfaces, packet formats and operating semantics in a small network without a conventional DNS server. If you plan to use Avahi, do not disable this option.</description>
  <port protocol="udp" port="5353"/>
  <destination ipv4="224.0.0.251" ipv6="ff02::fb"/>
</service>